Pratique du Shadowing: What NASA Found on Io - Apprendre l'anglais à l'oral avec YouTube
C1
Out here, deep into space and far away from the sun,
175 phrases
Si les phrases sont trop courtes ou trop longues, cliquez sur Edit pour les ajuster.
1
Out here, deep into space and far away from the sun,
2
you might expect everything to be frozen and lifeless.
3
And yet, we find images like this,
4
captured by one of NASA's most advanced research probes,
5
that shows us these bizarre structures seemingly created by a process that is unlike anything we know on Earth.
6
Earth.
7
Jupiter's moon Io is more alive than any other body in our solar system.
8
Its rocky surface is caught up in a raging battle between fire and ice.
9
Meanwhile, scientists on Earth have only just begun to uncover the hidden forces that are driving this chaos.
10
The Jupiter system is home to nearly 100 officially recognized moons,
11
a number that continues to grow as we discover new objects orbiting the giant planet.
12
Most of them are very small,
13
but four are exceptionally large.
14
We call these the Galilean moons,
15
as they were first recognized by the 16th century astronomer Galileo Galilei using one of the first telescopes ever made.
16
The outer two moons are the largest, Callisto and Ganymede.
17
Both are solid orbs of ice and rock with dead, heavily cratered surfaces.
18
Second in line is Europa,
19
which is made from a thin,
20
smooth sheet of ice floating on a vast ocean of liquid water.
21
It's one of the most promising locations in the solar system to find extraterrestrial life.
22
And then closest to Jupiter is Io,
23
just 350,000 kilometers above the clouds of the gas giant,
24
not much further than the distance between Earth and our moon,
25
and about the same size,
26
just a little bigger and heavier.
27
Io is actually the most dense moon in our solar system,
28
and that's because it's made almost entirely of rock and metal,
29
while most of the other large moons out here are made of ice and rock.
30
The difference is so extreme
31
that Io is believed to have the lowest water content of any known body in the solar system,
32
even drier than Mercury, the closest planet to the sun.
33
But what really makes Io special is the action on its surface.
34
This is the only location outside of the Earth where we know that volcanoes are erupting on a regular basis.
35
Io is actually the most volcanically active place in our entire solar system,
36
with up to 400 active volcanoes dotting the entire surface of the Moon.
37
This discovery was first made by the Voyager 1 probe during its Jupiter flyby in 1979.
38
Even from a distance of 20,000 kilometers and using primitive,
39
low-resolution cameras, Voyager was able to see nine distinct volcanic eruptions blasting out from the moon's surface.
40
These raging lava flows exist in stark contrast to a world that is consumed by a deep freeze.
41
Outside of the volcanic zones,
42
the surface temperature of Io drops down to negative 130 degrees Celsius.
43
We know that the Sun is too far away to contribute any warmth to the Jupiter system,
44
so where does all of this heat come from?
45
First, we need to appreciate that Io is caught up in a very treacherous location.
46
At this close distance to Jupiter,
47
it's just far enough away to avoid getting sucked in or even torn apart by the planet's massive gravity.
48
But that doesn't mean that Io is in a safe place either.
49
The extreme gravity from Jupiter still pulls on the moon's surface hard enough to stretch the rock and distort its shape.
50
And then on the other side there are these three other large Galilean moons,
51
and they exert their own force of gravity.
52
Not nearly as strong as Jupiter,
53
but still enough to pull Io in the opposite direction,
54
which disrupts its orbit around Jupiter.
55
So instead of moving in a circular pattern,
56
Io orbits in an oval shape,
57
meaning sometimes it's really close to Jupiter and other times it's further away.
58
So it never gets an even exposure to that extreme gravity,
59
and it cycles back and forth about once every two days,
60
constantly being stretched and released and changing shape as it moves along.
61
The result is that Io experiences some pretty massive tidal bulging.
62
This is the same effect that we see with the ocean on Earth.
63
Our own moon has enough gravity to pull up on the water,
64
causing high and low tides.
65
The rise of the ocean on Earth is only about half a meter on average.
66
Different coastal locations will experience varying amounts of tidal change based on their geography,
67
but in the middle of the ocean the change is very small.
68
On I.O., the gravity of Jupiter does something insane,
69
lifting the surface by as much as 100 meters when the two bodies are at their closest distance.
70
And that is not just pulling up water,
71
That's stretching solid rock and essentially giving the moon itself a slight egg shape.
72
All of this stretching and squeezing acts like a pump
73
that drives energy into the center of Io and powers all of this volcanic activity.
74
But these volcanoes do not function in the same way that we see on Earth.
75
If you think about a volcanic eruption,
76
you probably imagine a big pointy mountain with lava and ash shooting out from the top.
77
These tend to form along areas where tectonic plates collide,
78
and force rock up from below the surface.
79
I.O doesn't have plate tectonics,
80
so lava just tends to erupt from cracks that form as a result of the constant gravitational stretching.
81
The initial release of energy can throw lava dozens of kilometers above the moon's surface,
82
and above that, a plume of sulfur gas can rise for hundreds of kilometers.
83
Sulfur is always present in volcanic activity on Earth as well.
84
If you ever see a lava rock that has all of these round holes all over it,
85
those are created by trapped pockets of sulfur gas.
86
The result of this is a sulfur atmosphere that surrounds Io.
87
Depending on the level of volcanic activity at any given time,
88
the atmosphere can range from about one-third the density of Earth's to nearly double.
89
Most of the sulfur that gets released will eventually settle back down and cover the moon's surface.
90
This is what creates the range of vibrant colors that we see from orbit.
91
The yellow regions are sulfur that has been crystallized by the low temperatures, essentially snow.
92
The white and blue patches are frozen sulfur dioxide that exist in the coldest shadow regions of the moon.
93
The green areas are sulfur monoxide which is created by interactions with Jupiter's radiation belt in the upper atmosphere.
94
And then, the red areas are hot spots of recent volcanic activity where the sulfur is still being actively heated.
95
Going back to what we mentioned earlier,
96
volcanic activity on Io does not create mountains or raised shield structures like it does on Earth.
97
Instead, after the initial violence of the eruption,
98
the moon's surface tends to collapse down and molten rock fills the void to create these giant lava lakes.
99
The biggest one is named Lohipatara.
100
It's 200 kilometers in diameter,
101
and in the center, there's a big island of solidified rock surrounded by an active churning lake of molten rock.
102
Now because of all this volcanic activity,
103
you might think that Io is composed just like the Earth,
104
with a solid crust layer floating on top of a magma ocean.
105
But we are pretty sure that's not the case.
106
Probes sent to the Jupiter system have been able to measure the gravity field of the Moon,
107
and what they notice is a very uneven pull of gravity around the surface.
108
That tells us the magma is not evenly distributed,
109
it's probably trapped in localized pockets of molten rock
110
that are created in the areas that experience the largest amount of tidal flexing.
111
So what you end up with are hundreds of separate volcanic engines hidden underground,
112
which means every volcano is going to behave a little differently.
113
Okay, here's another mystery.
114
If volcanoes and plate tectonics aren't creating mountains on I.O.,
115
then where did this thing come from?
116
This is called Steeple Mountain.
117
At somewhere between 5 and 7 kilometers in height,
118
it's one of the most iconic views associated with I.O.,
119
mostly because it looks a lot like the spire of a church steeple,
120
or the Eye of Sauron.
121
We are able to see such detailed images like these thanks to data collected by NASA's Juno spacecraft,
122
which arrived at Jupiter in 2016 on a five-year mission to study the atmosphere of the gas giant.
123
After completing that goal, Juno was repurposed to investigate the four Galilean moons.
124
The probe completed two close flybys of Io,
125
the first in December 2023 and a second in February 2024,
126
coming within 1,500 kilometers of the surface.
127
What Juno saw out there is possibly the most unique landscape in our solar system.
128
It quickly found that Steeple is actually just one of many tall,
129
spiky mountains dotted around the surface of Io.
130
The tallest of them rises 18 kilometers,
131
or about double the height of Mount Everest.
132
And what's really interesting is that unlike Everest,
133
these structures on Io are all just kind of lone wolves.
134
There are no dense groupings or mountain ranges to be found,
135
just these seemingly random peaks stabbing straight up into the air.
136
That tells us that these mountains did not form slowly over time.
137
Instead, they burst from the ground suddenly,
138
like an alien from a guy's chest in that movie Alien.
139
Now, we're pretty sure that this is all still linked to volcanic activity,
140
just in a very unusual way.
141
So earlier, we talked about how the lava flow tends to cause the surface of Io to collapse
142
and form these giant lakes.
143
The idea is that this downward pressure into the surface actually causes a nearby area of rock to get pushed up.
144
Imagine if every time a sinkhole opened on the Earth,
145
a new mountain just sprung up right beside it.
146
That is kind of what we're looking at here.
147
The result would be unlike any mountain you've ever seen before,
148
and this is the kind of bizarre natural process that has been playing out on I.O for billions of years,
149
with the surface in a constant state of rise and fall thanks to the relentless pull of Jupiter's gravity.
150
Sadly though, these images could be the last we ever see of Io.
151
With NASA's Juno spacecraft slowly running out of fuel,
152
it's set to be replaced by two new robotic explorers of the Jupiter system.
153
One is called JUICE, which stands for the Jupiter Icy Moons Explorer.
154
It was made by the European Space Agency and launched in 2023.
155
When it arrives at Jupiter in 2031,
156
JUICE will investigate three of the Galilean moons, Ganymede, Callisto, and Europa.
157
Europa, looking specifically at their icy surfaces and hidden oceans of liquid water.
158
Then there is NASA's latest deep space probe,
159
the Europa Clipper, which launched in 2024 and will arrive at its destination in 2030.
160
As you can probably tell from the name,
161
this mission is directed specifically at the moon Europa
162
and will be primarily looking for signs of alien life in the watery depths below its surface.
163
That leaves Io as the odd one out.
164
There is no probe heading there any time in the near future,
165
and that's not because IO isn't deeply fascinating in its own right,
166
it's largely
167
because we didn't realize just how interesting the moon was until we saw these Juno images just a couple of years ago.
168
Also it definitely doesn't have aliens,
169
which automatically drops down to priority level.
170
But priorities are changing at NASA.
171
There is exciting new leadership coming in,
172
there are unprecedented new rocket technologies emerging,
173
and sometime in the not-so-distant future,
174
we could be studying the deep solar system just as thoroughly as we investigate Mars and the Moon.
175
Until then, we'll always have Steeple Mountain.
Télécharger l'application
Notation IA pour chaque phrase que vous prononcez
TRENDING
Populaires
Context & Background
In this fascinating video titled "What NASA Found on Io," we delve deep into the unique characteristics of Jupiter's moon, Io. The narrator presents stunning insights about Io's volcanic activity and geological features, contrasting it with other moons in the Jupiter system. This engaging content not only informs viewers about space exploration but also provides a rich context for English language learners to improve their listening and speaking skills. By using advanced vocabulary and complex sentence structures, the video serves as an excellent resource for those practicing English speaking through the shadowspeak technique.
Top 5 Phrases for Daily Communication
- “Caught up in a raging battle” - This phrase describes a conflict or struggle, making it useful for expressing tension in various contexts.
- “Most volcanically active place” - An expression that highlights a location known for frequent volcanic activity, which can be applied in discussions about nature or geology.
- “Low-resolution cameras” - This phrase refers to the quality of images taken, pertinent in conversations about technology and photography.
- “Stark contrast” - A useful phrase that signifies a noticeable difference, ideal for comparing two distinct ideas or situations.
- “Extreme gravity” - This term can be used in conversations about physics or outer space, illustrating the force acting on objects.
Step-by-step Shadowing Guide
To effectively use the shadowing technique with this video, follow these steps to enhance your English speaking practice:
- Watch the Video Twice: First, watch without subtitles to get the general idea. Then, watch it again with subtitles to understand the vocabulary and phrases more clearly.
- Select Short Segments: Break the video into smaller sections, ideally 30 seconds long. Focus on sections that contain rich vocabulary and complex phrases for more effective practice.
- Listen and Repeat: Play each segment and pause it after a sentence. Attempt to mimic the pronunciation, intonation, and rhythm of the speaker. This practice aligns with the goals of shadowspeak.
- Record Yourself: After practicing, record your voice while repeating the phrases. Compare your recording with the original to identify areas for improvement in clarity and pronunciation.
- Use it in Conversation: Try to incorporate the learned phrases into your daily conversations. This reinforces your memory and boosts your confidence in speaking.
By utilizing this shadowing site to improve your language skills through the captivating content about Io, you not only enhance your vocabulary but also develop a deeper understanding of dynamic speech patterns and expressions.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.
☕ Offrez-nous un café
ShadowingEnglish reste 100% gratuit grâce à votre soutien. Les coûts des serveurs et de l'IA sont élevés — votre café nous aide à continuer ! 🙏